The unidentified injured worker was taken to Harbor UCLA Medical Center.

The dead worker was only identified as a member of the International Longshore and Warehouse Union.

Port Executive Director Gene Seroka says it's particularly tragic that the accident occurred on the day of the union's annual "First Blood" commemoration. The event remembers workers killed in a melee during a 1934 strike and others killed on the job.

The accident is being investigated by port police, state occupational safety officials and the Coast Guard.